Pipe coupling socket



FIG. 1 is a perspective view taken from the top, front and left side of a pipe coupling socket showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a right side elevational view thereof;

FIG. 8 is a front elevational view of a coupling socket in the state when plug is connected;

FIG. 9 is a front elevational view of a coupling socket in the state when plug is connected and the outer sleeve is slid; and,

FIG. 10 is a front elevational view of a coupling socket in the state when plug is connected and an inner sleeve is turned and the outer sleeve is locked.

The broken line showing in FIGS. 8-10 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for pipe coupling socket, as shown and described. 